Well for optimists yes. But, in the trading you must have your feet on the ground and always ask yourself about what yours and other traders’ next move will be. Like in chess. Don’t be afraid of the worst scenarios and plan in advance. Doing that, you can ‘smell’ possible treats and scamming attempts.
Scamming can be done in many ways. It can be done by retrieving account once when you sent the money, or by sending you the false info, broken items, etc.
World of Warcraft, as a biggest and the most popular MMORPG is on the top of those games who are under biggest threat, but honestly no online game is immune to scams.